Bell-type furnace combustion system

Abstract

The utility model discloses a bell-type furnace combustion system which comprises a combustor, a fuel gas pipeline, an air pipeline and a smoke pipeline. The combustor is arranged in a hearth of the bell-type furnace; one end of the gas pipeline is communicated with an external gas supply pipeline, and the other end of the gas pipeline is communicated with a burner of the burner; a first valve assembly for controlling the on-off of the gas pipeline is arranged on the gas pipeline, and a filter is arranged on the gas pipeline at the upstream of the first valve assembly; one end of the air pipeline is communicated with an external air supply pipeline, and the other end of the air pipeline is communicated with a burner of the burner; the air pipeline is provided with a second valve assembly used for controlling connection and disconnection of the air pipeline. The utility model has the beneficial effects that the air pipeline and the gas pipeline are respectively provided with the valve components for controlling the on-off of the pipelines, and the two valve components are closed in a temperature control heating or heat preservation stage, so that cold air can be effectively prevented from entering the furnace to reduce the temperature of the furnace, the energy consumption is reduced, and the waste of energy is avoided.

Description

Technical Field

[0001] The present invention relates to the field of steel heat treatment, and particularly to a bell-type furnace combustion system. Background Art

[0002] As a furnace type for realizing steel heat treatment, the bell-type furnace is widely used in the annealing of steel types such as carbon steel, stainless steel, and silicon steel. According to the different protective atmospheres in the furnace, the bell-type furnace is divided into a full-hydrogen bell-type furnace and a nitrogen-hydrogen bell-type furnace. The bell-type furnace mainly consists of a heating hood, a furnace platform, an inner hood, and a cooling hood. The combustion system of the bell-type furnace generally adopts the technology of continuous + full on-off (pulse). In the temperature control heating or heat preservation stage, when the combustion system stops working, only the gas pipeline is cut off, and the air pipeline in the burner is not cut off, and cold air continues to enter the furnace to reduce the furnace temperature, resulting in energy waste and increased emissions.

[0003] Therefore, it is necessary to improve the existing technology. Summary of the Invention

[0004] The purpose of the present utility model is to provide a bell-type furnace combustion system aiming at the deficiencies of the existing technology, aiming to reduce energy consumption.

[0005] The technical solution adopted by the present utility model is: a bell-type furnace combustion system, including a burner, a gas pipeline, an air pipeline, and a flue gas pipeline;

[0006] The burner is arranged in the bell-type furnace hearth;

[0007] One end of the gas pipeline is communicated with the gas supply pipeline, and the other end of the gas pipeline is communicated with the burner nozzle;

[0008] A first valve assembly for controlling the on-off of the gas pipeline is arranged on the gas pipeline, and a filter is arranged on the gas pipeline upstream of the first valve assembly;

[0009] One end of the air pipeline is communicated with the air supply pipeline, and the other end of the air pipeline is communicated with the burner nozzle;

[0010] A second valve assembly for controlling the on-off of the air pipeline is arranged on the air pipeline;

[0011] The inlet of the flue gas pipeline is communicated with the inside of the bell-type furnace hearth; the outlet of the flue gas pipeline is communicated with the flue.

[0012] According to the above solution, a gas analysis alarm instrument is arranged on the outlet side of the flue gas pipeline.

[0013] According to the above solution, the first valve assembly includes two ball valves sequentially arranged on the gas pipeline downstream of the filter.

[0014] According to the above solution, the second valve assembly includes a butterfly valve arranged on the air pipeline.

[0015] According to the above solution, the bell-type furnace combustion system further includes a heat exchanger. The heat source channel of the heat exchanger is communicated with the flue gas pipeline, and the cold source channel of the heat exchanger is communicated with the air supply pipeline.

[0016] According to the above solution, the bell-type furnace combustion system further includes a circumferentially arranged gas pipeline network and an air pipeline network; the gas pipeline network is respectively communicated with the gas pipeline and the gas supply pipeline; the air pipeline network is respectively communicated with the air pipeline and the air supply pipeline.

[0017] According to the above solution, the burner is also equipped with a flame detection instrument.

[0018] According to the above solution, the bell-type furnace combustion system further includes a bypass pipeline, and both ends of the bypass pipeline are respectively communicated with the flue gas pipeline upstream and downstream of the heat exchanger.

[0019] The beneficial effects of the present utility model are as follows:

[0020] 1. In the present utility model, valve assemblies for controlling the on-off of the pipeline are respectively arranged on the air pipeline and the gas pipeline. During the temperature control heating or heat preservation stage, both valve assemblies are closed, which can effectively prevent cold air from entering the furnace to reduce the furnace temperature, reduce energy consumption, avoid waste of energy, and then also reduce the flue gas emissions generated by fuel combustion, achieving energy conservation and environmental protection.

[0021] 2. In the present utility model, a filter is arranged on the gas pipeline to filter the gas, which can effectively prevent substances in the gas from causing jamming of the downstream first valve assembly and ensure normal production.

[0022] 3. In the present utility model, a gas analysis alarm instrument is arranged in the flue gas pipeline, which can give an alarm in time when the valve assembly on the gas supply pipeline is jammed and gas leaks into the flue gas pipeline, ensuring the safe and stable operation of the whole system. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic structural diagram of a specific embodiment of the present utility model.

[0024] Wherein: 1 - gas pipeline network; 2 - first valve assembly; 2.1 - ball valve; 2.2 - first solenoid valve; 3 - burner; 4 - second valve assembly; 4.1 - butterfly valve; 4.2 - second solenoid valve; 5 - filter; 6 - gas analysis alarm instrument; 7 - gas pipeline; 8 - gas supply pipeline; 9 - air pipeline; 10 - air supply pipeline; 11 - flame detection instrument; 12 - heat exchanger; 13 - flue gas pipeline; 14 - bypass pipeline; 15 - flue; 16 - air pipeline network. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0025] To better understand the present utility model, the present utility model will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0026] As Figure 1 shown, a bell-type furnace combustion system includes a burner 3, a gas pipeline 7, an air pipeline 9, and a flue gas pipeline 13;

[0027] The burner 3 is arranged inside the bell-type furnace hearth;

[0028] One end of the gas pipeline 7 is communicated with a gas supply pipeline 8, and the other end of the gas pipeline 7 is communicated with the burner of the burner 3;

[0029] A first valve assembly 2 for controlling the on / off of the gas pipeline 7 is arranged on the gas pipeline 7, and a filter 5 is arranged on the gas pipeline 7 upstream of the first valve assembly 2;

[0030] One end of the air pipeline 9 is communicated with an air supply pipeline 10, and the other end of the air pipeline 9 is communicated with the burner of the burner 3;

[0031] A second valve assembly 4 for controlling the on / off of the air pipeline 9 is arranged on the air pipeline 9;

[0032] The inlet of the flue gas pipeline 13 is communicated with the inside of the bell-type furnace hearth (not shown in the drawings); the outlet of the flue gas pipeline 13 is communicated with a flue 15.

[0033] Preferably, a gas analysis alarm 6 is arranged on the outlet side of the flue gas pipeline 13; when the gas analysis alarm 6 detects that the gas component in the flue gas pipeline 13 exceeds the set value, it will start to alarm.

[0034] In the present utility model, the gas pipeline 7 and the air pipeline 9 respectively supply gas and air for the burner 3 for combustion; the flue gas generated by combustion in the bell-type furnace hearth is discharged through the flue gas pipeline 13, which is a conventional technical means in the industry, and the bell-type furnace and its connection with the extended section of the flue gas pipeline 13 are not shown in the drawings; the flue 15 is communicated with the flue gas network.

[0035] In this embodiment, a plurality of burners 3 are arranged inside the bell-type furnace hearth, and the nozzles of each burner 3 are respectively communicated with the air pipeline 9 and the gas pipeline 7.

[0036] Preferably, the first valve assembly 2 includes two ball valves 2.1 arranged in sequence on the gas pipeline 7 downstream of the filter 5.

[0037] Preferably, the second valve assembly 4 includes a butterfly valve 4.1 arranged on the air pipeline 9.

[0038] In the present utility model, both the first valve assembly 2 and the second valve assembly 4 are arranged outside the bell-type furnace hearth.

[0039] Preferably, the bell-type furnace combustion system further includes a heat exchanger 12. The heat source channel of the heat exchanger 12 is communicated with the flue gas pipeline 13, and the cold source channel of the heat exchanger 12 is communicated with the air supply pipeline 10.

[0040] Preferably, the bell-type furnace combustion system further includes a bypass pipeline 14. The two ends of the bypass pipeline 14 are respectively communicated with the flue gas pipelines 13 upstream and downstream of the heat exchanger 12.

[0041] In the present utility model, the flue gas discharged from the bell-type furnace furnace exchanges heat with air. The preheated air enters the burner 3. The temperature of the flue gas after heat exchange decreases and enters the flue gas network through the flue 15.

[0042] In the present utility model, the bell-type furnace combustion system further includes a circumferentially arranged gas pipeline network 1 and an air pipeline network 16; the gas pipeline network 1 is respectively communicated with the gas pipeline 7 and the gas supply pipeline 8; the air pipeline network 16 is respectively communicated with the air pipeline 9 and the air supply pipeline 10.

[0043] Preferably, the burner 3 is further equipped with a flame detection instrument 11.

[0044] The working principle of the present utility model is as follows:

[0045] When the bell-type furnace heat-treats steel and is in the temperature control heating or heat preservation process, when the temperature in the bell-type furnace furnace has reached the controlled temperature required by the process, the combustion system does not need to heat anymore, and all the burners 3 of the entire combustion system are turned off. The closing sequence is: first, cut off the gas pipeline 7 in front of the burner 3 through the first valve assembly 2, and then cut off the air pipeline 9 in front of the burner 3 through the second valve assembly 4. In order to protect the first valve assembly 2 on the gas pipeline 7, a filter 5 is provided at the front end of the gas pipeline 7 to filter the gas. At the same time, a gas analysis alarm instrument 6 for analyzing the gas is provided at the end of the flue gas pipeline 13. When the first valve assembly 2 on the gas pipeline 7 cannot be completely closed due to dirty gas jamming the valve, at this time, due to the absence of air, the leaked gas cannot burn directly and will directly enter the flue gas pipeline 13, causing black smoke or safety risks. The gas analysis alarm instrument 6 detects and alarms in time to ensure the safe and stable operation of the whole system. When the bell-type furnace needs to be heated for temperature control, all the burners 3 are turned on. The opening sequence is to first open the second valve assembly 4 of the air pipeline 9 to connect the air, and then open the first valve assembly 2 of the gas pipeline 7 to connect the gas for ignition and combustion, and operate in sequence according to the temperature control requirements of the bell-type furnace in a cycle.

[0046] In the present utility model, the first valve assembly 2 may further include a first solenoid valve 2.2, and the second valve assembly 4 may further include a second solenoid valve 4.2; both the first solenoid valve 2.2 and the second solenoid valve 4.2 are connected to a controller for production, and the controller controls the two.

[0047] The above-disclosed are only the preferred embodiments of the present utility model, and of course, the scope of rights of the present utility model cannot be limited thereby. Therefore, equivalent changes made according to the scope of the patent application of the present utility model still fall within the protection scope of the present utility model.

Claims

1. A bell-type furnace combustion system, characterized in that, It includes a burner, a gas pipeline, an air pipeline and a flue gas pipeline; The burner is arranged in the hearth of the bell-type furnace; The gas pipeline is communicated with the burner nozzle; A first valve assembly for controlling the on-off of the gas pipeline is arranged on the gas pipeline, and a filter is arranged on the gas pipeline upstream of the first valve assembly; The air pipeline is communicated with the burner nozzle; A second valve assembly for controlling the on-off of the air pipeline is arranged on the air pipeline; The inlet of the flue gas pipeline is communicated with the inside of the hearth of the bell-type furnace; the outlet of the flue gas pipeline is communicated with the flue.

2. The bell-type furnace combustion system according to claim 1, wherein A gas analysis alarm instrument is arranged on the outlet side of the flue gas pipeline.

3. The bell-type furnace combustion system according to claim 1, characterized in that, The first valve assembly includes two ball valves arranged in sequence on the gas pipeline downstream of the filter.

4. The bell-type furnace combustion system according to claim 1, characterized in that, The second valve assembly includes a butterfly valve arranged on the air pipeline.

5. The bell-type furnace combustion system according to claim 1, wherein, The bell-type furnace combustion system further includes a heat exchanger. The heat source channel of the heat exchanger is communicated with the flue gas pipeline, the cold source channel of the heat exchanger is communicated with the air supply pipeline, and the air supply pipeline is communicated with one end of the air pipeline.

6. The bell-type furnace combustion system according to claim 1, characterized in that, The bell-type furnace combustion system further includes a circumferentially arranged gas pipeline network and an air pipeline network; the gas pipeline network is respectively communicated with the gas pipeline and the gas supply pipeline; the air pipeline network is respectively communicated with the air pipeline and the air supply pipeline.

7. The bell-type furnace combustion system according to claim 1, wherein The burner is also equipped with a flame detection instrument.

8. The bell-type furnace combustion system according to claim 5, characterized in that, The bell-type furnace combustion system further includes a bypass pipeline, and both ends of the bypass pipeline are respectively communicated with the flue gas pipeline upstream and downstream of the heat exchanger.

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